For internal blocks, space saving can be achieved by either compressing keys or pointers.
2.
Changes included requiring that the barrels have internal blocks to prevent the firing of projectiles.
3.
The highland is characterized as a cutting horst dipping to the SE with internal block structure.
4.
For string keys, space can be saved by using the following technique : Normally the i-th entry of an internal block contains the first key of block i + 1.